The following etching reagents and directions for their use are suggested for revealing
the macro structure.
Aluminum and Aluminum-Base Alloys
Hydrochloric acid (concentrated) 15 ml
Hydrofluoric acid (48%) 10 ml
Water 85 ml
This solution is to be used at room temperature, and etching is accomplished by either
Aluminum and Aluminum-Base Alloys
Hydrochloric acid (concentrated) 15 ml
Hydrofluoric acid (48%) 10 ml
Water 85 ml
This solution is to be used at room temperature, and etching is accomplished by either
swabbing or immersing the specimen.
U cane also refer to following:
| Etchant | Conc. | Conditions | Comments |
| Kellers Etch Distilled water Nitric acid Hydrochloric acid Hydrofluoric acid | 190 ml 5 ml 3 ml 2 ml | 10-30 second immersion Use fresh | For most aluminum and aluminum alloys |
| Methanol Hydrochloric acid Nitric acid Hydrofluoric acid | 25 ml 25 ml 25 ml 1 drop | 10-60 seconds | Pure aluminum, aluminum-magnesium, and aluminum-magnesium-silicon alloys |
| Krolls Reagent Distilled water Nitric acid Hydrofluoric acid | 92 ml 6 ml 2 ml | 15 seconds | Aluminum-copper alloys |
C Sridhar.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited,. Bangalore
( SS, AL fabricators & A venture of Advance Eng. Training & Inspection Services). Chennai,
Mobile nos: 0 94449 71097, 0 7406 326326, 0 94445 21267.
Technical Adviser - Welding,
for Alsta Pristine Engineering Private Limited,. Bangalore
( SS, AL fabricators & A venture of Advance Eng. Training & Inspection Services). Chennai,
Mobile nos: 0 94449 71097, 0 7406 326326, 0 94445 21267.
Please don't print this e-mail unless you really need to. Save the environment.
From: anand babloo <bravanand@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wednesday, 25 March 2015 12:53 PM
Subject: [MW:23002] Reg - Etchant for Aluminum material
Dear Experts,
-- I need certain Aluminum weld samples to be Macro etched .
The grades of Aluminum are ALU 5052 & ALU 1050.
Kindly advice me that which etchant has to be used to reveal proper weld fusion.
Thanks in advance :)
Awaiting experts advice.
With regards,
R.Anand Raj
CSWIP 3.1 Welding Inspector
ASNT LEVEL II
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